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Old 03-05-2011, 04:00 PM   #1
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Vapor barrier on exterior wall in shower


I gutted my bathroom to the studs and am now ready to put up the cement board. two walls are interior and one exterior. I put 4mil plastic on studs, over kraft faced insulation (put many vertical slits in the insulation) on the interior walls. my question is, what should I do with the one exterior wall? It has kraft faced insulation on it but do I do the same as what I did with the interior walls or leave just the insulation there and put on the cement board? the house is located in the northeast

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Old 03-05-2011, 05:59 PM   #2
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Vapor barrier on exterior wall in shower


I would leave the insulation alone, don't install a moisture barrier at all. Then waterproof the inside of the board with a liquid waterproofing.

Otherwise slit the facing and install the moisture barrier.

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Old 03-05-2011, 06:14 PM   #3
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Vapor barrier on exterior wall in shower


doesn't this violate the two layer barrier rule? I would have a vapor barrier on both sides of the cement board if I paint on the liquid barrier.
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Old 03-05-2011, 06:40 PM   #4
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Vapor barrier on exterior wall in shower


i agree with bud. if it was my house i would leave it alone as long as there is no poly involved. or of you would sleep better at night i would remove it and put unfaced. then hang cement board and waterproof it with kerdi or some kind of liquid (redguard for example)
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Old 03-05-2011, 06:56 PM   #5
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Vapor barrier on exterior wall in shower


ok. so cement board over the kraft faced insulation is adequate? If so, that is what I will do
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Old 03-05-2011, 09:30 PM   #6
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Vapor barrier on exterior wall in shower


spray mold control behind insulation,or call a mold control place they should know what to do.Yellow pages here you come.

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